Hardness Testers

Hardness testing is the most valuable and most widely used mechanical test for evaluating the properties of materials, by far. The hardness of material is usually considered resistance to permanent indentation. It has a dial with electronic feedback for easy measurement and needs a power supply of AC220V±5% with frequency near to 50 Hz-60 Hz. The voltage required to operate the tool is 110V – 220V.

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Detailed Description for Hardness Testers

Hardness has variety of meanings. In the metal industry, it is considered as resistant to permanent deformation. To the metallurgist, it is referred as penetration. To the machinist, it means resistance to machining. 

Types of hardness tests

Depending upon the plastic of material, hardness test has been classified in various tests.

Indentation tests: The hardness is calculated by amount of permanent deformation, or plastic flow of the material. 

      Rockwell testing: Hardness is determined by depth of the indentation in the test material resulting from applied force on the specific indenter.

      Brinell test: Hardness is specified by impression created by forcing or applying a specific indenter into the test material under a specific force for a given interval of time. 

Micro hardness testing: Indicates that the applied force on the indenter is no more than 1kg. Micro hardness is determined by calculating the area of the indentation rather than the depth.

Special indentation tests: Monotron test is the best example of such type of test. This principle was the reverse of conventional testers like Brinell and Rockwell test. In this test, the monotron indenter was forced into the material being tested to a given depth and then the hardness was achieved by determining the force required to achieve the given depth. 

Rebound principle: This test prioritise more on the elastic limit of material than the work-hardening and tensile strength characteristics. 

Scratch hardness test: Instrument used for this test includes microscope, stage, sliding weight to apply loads to 3g and a diamond point. In operation, the material being tested is scratched by the diamond and that scratch is compared with standard limit of scratches in the microscopic piece.

Abrasion and erosion testing: Selection of material for specific applications is mainly done on the basis of wear resistance, which is directly related to hardness. So abrasion testing is often used.

 

Classes of tests:

There are three classes of tests:

Class 1-  single parts from large lots are tested in shops and laboratories.

Class 2-  a) Speed of testing is essential. There is some loss in testing accuracy though.

             b) There is less emphasis on speed of testing. This class is applied to use large castings that are normally outside the range of conventional equipment.

Class 3- These testing are mostly done in laboratories, concerned with the process control. Example: Micro hardness testing.


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Seema S

Testing the hardness was never so easy before; with such accuracy! Posted on 8/12/2016

Before buying, make sure that you know the range of hardness of the product which you need the tester for.

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